The majority of cellphone chargers have a flying lead that terminates in such a micro-USB connector, and are therefore physically compatible with the Pi. However, that is not true of all cellphone chargers, and nor does it mean that all cellphone chargers terminating in a micro-USB male connector are compatible with the Pi. One important consideration is that they need to be able to deliver roughly 700mA (0.7 A) within the rated +5V USB supply voltage limits, and it is not uncommon that they cannot do so.

If you are inexperienced in electronics or computers, it's probably best to check the information at the eLinux.org Pi site -- http://elinux.org/RaspberryPiBoard -- and pick a charger from among those that other people have found to work.

"Are they an exact match for the USB connector for the RaspberryPi??????"

The Androids are, yes. But if you're worried, don't be. If they don't fit, you won't get them fitting either. Just be sure it powers around 700 mA (0.7A), or even better, around 1A (that way you'll be sure it can handle everything) at 5 volts.

Also note that Amperes can't really break your Pi. See it as... cookies. 1A compared against 0.7A means you'll give your Pi more cookies, but it'll always eat just the right amount of cookies. But giving more than 5 volts (or less) will make the cookies... "poisoned".

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